Cymbiodyta, BEDEL, 1881

Angus, Robert B, Sadílek, David, Shaarawi, Fatma, Dollimore, Hayley, Liu, Hsing-Che, Seidel, Matthias, Sýkora, Vít & Fikáček, Martin, 2021, Karyotypes of water scavenger beetles (Coleoptera: Hydrophilidae): new data and review of published records, Zoological Journal of the Linnean Society 192 (3), pp. 958-958 : 958-

GENUS CYMBIODYTA BEDEL, 1881

( FIG. 8A, I )

Material examined: Cymbiodyta marginella (Fabricius, 1792) : 1 spec. ( BMNH): Greece, Corfu , R. Angus lgt .

K a r y o t y p e: 2 n = 1 6 + X y p (♂). E i g h t p a i r s o f metacentric or submetacentric autosomes showing a gradual decrease in size, pair 8 is about half the

length of pair 1. The metacentric X chromosome is the smallest in the nucleus, apart from the dot-like y.

Note: The monotypic genus Helocombus (LeConte, 1855) was synonymized with Cymbiodyta by Toussaint & Short (2019). The karyotype of its only species, Cymbiodyta bifidus (LeConte, 1855) , was examined by Smith (1960) and reported to be 2 n = 16 + Xy p (♂), corresponding to our findings in the European C. marginella .

Figures

Figure 8. Mitotic karyotypes of the Enochrinae. A, Cymbiodyta marginella, embryo. B–D, European usual-looking species of Enochrus (Methydrus) from embryos: (B) Enochrus affinis; (C) Enochrus coarctatus; (D–E) Enochrus nigritus. F–G, unusual species assigned at the moment to Enochrus (Methydrus): (F) Enochrus morenae, midgut; (G) Enochrus sauteri, midgut. H, Enochrus (s.s.) melanocephalus, embryo. A–G, without treatment. H, C-banded. Habitus figures: (I) Cymbiodyta marginella; (J) Enochrus morenae.